There are one hundred and fourteen elements and each element forms a large number of compounds. It is, therefore, necessary to understand the basis of their properties and the rules according to which these react. This is possible if the elements are classified and grouped together based on their properties.
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Consider the following elements: K, I, Li, Sr, CI, Mg, Br, Ca, Na. Separate these elements in three groups or triads having similar properties. State one property in each case on the basis of which groups are separated.
Lithium, sodium and potassium were put in one group or triad on the basis of their similiar properties. What is the name of this group? State their properties.
